Given a RationalMapping between projective varieties these functions can be used to return the source or target.
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Note that the source of phi corresponds to the target of f and the target of phi corresponds to the source of f.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/RationalMaps.m2:1666:0.